Removing the requirements is a bad idea. A long time ago when I worked with Neodice they had similar terms and after they removed the requirements within a week they had several hundred obvious cases of abuse (I say this because I saw the evidence they provided) 
If a company don't want to waste their budget by pure giveaway, they will have to set up terms and conditions of their programs. Terms and conditions are so helpful to prevent abusements from users, bounty hunters, and it will increase positive effects they can get from programs.If things are executed with paid costs, it must be managed with clear and very detailed, well-minded terms and conditions. With any company, running marketing programs and let it abused easily is very bad as it is a way of using company budget inefficiently.